A website with 100 cool kitchen chemistry recipes for children to make:
http://www.accreditedonlinecolleges.com/blog/2010/kitchen-chemistry-100-cool-food-science-experiments-for-kids-and-cooks/

More kitchen science recipes to try:
http://chemistry.about.com/od/foodcookingchemistry/tp/kitchenscienceexperiments.htm

Bouncy Egg Science Experiment:

Kids Science Experiment - Slime:

How to make Flubber:

The Gingerbread Man

Jack and the Beanstalk

A website with some exciting experiments to try:

Exploratorium